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LT1129CST-3.3#TRPBF

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Analog Devices Linear Voltage Regulators (LDO), SOT-223-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LT1129CST-3.3#TRPBF

Analog Devices · Linear Voltage Regulators (LDO) · SOT-223-3

LT1129CST-3.3#TRPBF from Analog Devices, in a SOT-223-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VIN power_in The input pin supplies power to the device, with an absolute maximum input voltage of ±30V, and it withstands reverse voltages of 30V without reverse current flow.
2 GND power_in The ground pin (the SOT-223 tab is also GND) carries ground pin current of 50μA typical and 70μA maximum at no load, rising to 90μA maximum at 700mA load.
3 OUTPUT power_out The output pin supplies up to 700mA to the load and requires an output capacitor (3.3μF stable) to prevent oscillations.

Key specifications

Parameter Value
Manufacturer Analog Devices
Package SOT-223-3
Category Power Management ICs
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Regulated Output Voltage VOUT 3.25 3.3 3.35 V VIN = 3.8V, IOUT = 1mA, TJ = 25°C 4
Regulated Output Voltage VOUT 3.2 3.3 3.4 V 4.3V < VIN < 20V, 1mA < IOUT < 700mA, l (full operating temperature range) 4
Dropout Voltage VDROPOUT 0.13 0.2 V ILOAD = 10mA, TJ = 25°C 4
Dropout Voltage VDROPOUT 0.13 0.25 V ILOAD = 10mA, l 4
Dropout Voltage VDROPOUT 0.25 0.35 V ILOAD = 100mA, TJ = 25°C 4
Dropout Voltage VDROPOUT 0.25 0.45 V ILOAD = 100mA, l 4
Dropout Voltage VDROPOUT 0.37 0.45 V ILOAD = 500mA, TJ = 25°C 4
Dropout Voltage VDROPOUT 0.37 0.6 V ILOAD = 500mA, l 4
Dropout Voltage VDROPOUT 0.45 0.55 V ILOAD = 700mA, TJ = 25°C 4
Dropout Voltage VDROPOUT 0.45 0.7 V ILOAD = 700mA, l 4
Ground Pin Current IGND 50 70 μA ILOAD = 0mA, l 4
Ground Pin Current IGND 310 450 μA ILOAD = 10mA, l 4
Ground Pin Current IGND 2 3.5 mA ILOAD = 100mA, l 4
Ground Pin Current IGND 10 20 mA ILOAD = 300mA, l 4
Ground Pin Current IGND 25 45 mA ILOAD = 500mA, l 4
Ground Pin Current IGND 50 90 mA ILOAD = 700mA, l 4
Shutdown Threshold (Off to On) VSHDN 0.25 1.2 V VOUT = Off to On, l 4
Shutdown Threshold (On to Off) VSHDN 0.75 2.8 V VOUT = On to Off, l 4
Shutdown Pin Current ISHDN 6 10 μA VSHDN = 0V, l 4
Quiescent Current in Shutdown IQ(SHDN) 15 25 μA VIN = 6V, VSHDN = 0V, l 4
Line Regulation 1.5 10 mV ΔVIN = 4.8V to 20V, IOUT = 1mA, l 4
Load Regulation 6 15 mV ΔILOAD = 1mA to 700mA, TJ = 25°C 4
Load Regulation 20 30 mV ΔILOAD = 1mA to 700mA, l 4
Ripple Rejection RR 52 64 dB VIN, VOUT = 1V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 0.7A, TJ = 25°C 5
Current Limit ILIM 1.2 1.6 A VIN, VOUT = 7V, TJ = 25°C 5
Input Reverse Leakage Current IIN(REV) 1 mA VIN = -20V, VOUT = 0V, l 5
Reverse Output Current (LT1129-3.3) IOUT(REV) 16 25 μA VOUT = 3.3V, VIN = 0V 5
Input Voltage VIN 30 V Absolute maximum rating; ± 30V printed, contact factory for higher 2
Output Pin Reverse Current IOUT(REV) 10 mA Absolute maximum rating 2
Sense Pin Current ISENSE 10 mA Absolute maximum rating 2
Shutdown Pin Input Voltage VSHDN -0.6 6.5 V Absolute maximum rating, Note 2 2
Shutdown Pin Input Current ISHDN 20 mA Absolute maximum rating, Note 2 2
Storage Temperature Range TSTG -65 150 °C Absolute maximum rating 2
Operating Junction Temperature Range (LT1129C-X) TJ 0 125 °C LT1129C-X, Note 3 2
Thermal Resistance Junction-to-Ambient (ST package) θJA 50 °C/W ST package, 3-Lead SOT-223, as printed in pin configuration 2
Thermal Resistance Junction-to-Ambient (ST package, 2500 sq. mm topside copper) θJA 45 °C/W Table 2, topside 2500 sq. mm, backside 2500 sq. mm, board 2500 sq. mm 11
Thermal Resistance Junction-to-Ambient (ST package, 100 sq. mm topside copper) θJA 59 °C/W Table 2, topside 100 sq. mm, backside 2500 sq. mm, board 2500 sq. mm 11

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts COPPER Table 1. Q Package, 5-Lead DD COPPER AREA THERMAL RESISTANCE 11

CAD (KiCad official)

  • Symbol: LT1129CST-3.3#TRPBF
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223-3 (KiCad packages3D, STEP)
  • 3D model files: lt1129cst-3-3-trpbf-etched.step / lt1129cst-3-3-trpbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt1129cst-3-3-trpbf.step / lt1129cst-3-3-trpbf.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Analog Devices datasheet (16 pp, sha256 3bd8354699849a4f, retrieved 2026-10-28, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF